Fisherr SS-263 Volume Booster

Product Bulletin
SS-263 Volume Booster
62.3:SS-263
September 2014
D103592X012
Fisherr SS-263 Volume Booster
The Fisher SS263 volume booster is used in
conjunction with Fisher control valves with
double-acting piston actuators. Large piston actuators
require proportionally larger volumes of air to stroke;
typical valve positioner output cannot usually provide
enough of a volume of air to quickly and fully stroke
actuators such as these. The SS263 volume booster
solves this by amplifying the output from the valve
positioner to increase actuator stroking speed. The
dualported design of the booster amplifies both the
supply and exhaust flow, which are both precisely
controlled by means of a pneumatic signal from the
valve positioner.
The booster incorporates fixed deadband, soft seat
construction, and an integral bypass restriction. The
booster can be tuned by adjusting the bypass
restriction to respond to small or large input signal
changes, without sacrificing steady-state accuracy.
The SS-263 is essentially a higher capacity Fisher 2625
booster allowing up to three 2625’s to be replaced
with just one SS263. The booster also incorporates a
robust flangedstyle mounting that increases the unit’s
resilience to vibration damage, while allowing for easy
removal during field maintenance.
The standard noise attenuating exhaust trim allows air
to be exhausted quickly and quietly from the actuator.
Several integrated diagnostic connections on the body
of the booster allow connections to be made without
the need to remove the unit from the actuator. Such
connections allow for diagnostic testing, actuator
bypass assembly hookup for use with handwheel
operated actuators, and multiple accessory
connections. Multiple accessories can be connected
directly to the booster, eliminating long lengths of
tubing and simplifying the overall hookup schematic
for easy field maintenance.
The SS263 complies with the requirements of ATEX
Group II Category 2 Gas and Dust and is certified for
use in Safety Instrumented Systems (SIS) applications.
Compliance is identified on the product by labels
affixed to the housing.
www.Fisher.com
X0206
Features

Fast Response — The SS263 delivers highvolume
output for fast stroking speeds when responding to
large input signal changes and lowvolume output
when responding to small input changes.

High Capacity — Flow capacities of roughly three
times higher than the 2625 booster result in the
need for fewer fittings, tubing, and units.

Noise Attenuation — Exhaust is passed through
specially designed passages to reduce the amount
of ambient noise that is generated.

Adjustable Response — The integral bypass
restriction allows the booster to be easily and
readily tuned to operate under small or large input
signal changes.
Product Bulletin
SS-263 Volume Booster
62.3:SS-263
September 2014


Auxiliary Supply Connections — Supply air is readily
available through two 1/4 NPT connections that are
built into both sides of the unit for use with a Fisher
377 trip valve or other accessory.
D103592X012


Soft Seated Construction Soft seated exhaust and
supply valves provide for bubble tight shutoff to
reduce unnecessary air consumption and ensure fail
mode upon loss of plant air.

Robust Mounting — Flanged-style actuator
mounting provides ease of maintenance, simplified
tubing, compactness, and high vibration resistance.
3 in 1 Connection — This special connection can
provide any of the following connections, if needed.

1/4 NPT diagnostic connection for easy testing

1/4 NPT actuator bypass assembly connection for
use on an actuator with a handwheel
3/4 NPT connection, with the removal of a
bushing, for use with a high capacity dump valve
Table of Contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
Fisher Optimized Digital Valve Package . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Product Bulletin
SS-263 Volume Booster
62.3:SS-263
September 2014
D103592X012
Specifications
Supply Pressure Ranges
Maximum pressure must not exceed 10.3 bar (150
psig).
Input Signal
Positioner output
Maximum Input Signal Pressure(1)
10.3 bar (150 psig)
InputtoOutput Pressure Ratio
Fixed at 1 to 1
Construction Materials
Body: Aluminum, S31600
Seat Ring: Brass, S31600
Diaphragms: Nitrile/Nylon
Upper and Lower Valves: Nitrile/Aluminum
ORings: Nitrile and Fluorocarbon
Cap Screws: SAE GR 5 NCF3, 316 SST
Mounting Adaptor: S17400 DBL 1150
Mounting Studs: SA193B7 NCF2
Mounting Nuts: SA1942H NCF2
Mounting Washers: Plated Carbon Steel
Operative Temperature Limits(1)
40 to 71°C (40 To 160°F)
Connections:
Input Signal: 1/4 NPT
Supply: 1 NPT
Output: 1 NPT or 1-1/4 NPT(2)
Port Diameters
Supply Port: 19 mm (0.750 inch)
Exhaust Port: 19 mm (0.750 inch)
Maximum Flow Coefficients
Supply: 9.5 Cv
Exhaust: 9.5 Cv
C1: 35
Xt: 0.77
Hazardous Area Classification
Complies with the requirements of ATEX Group II
Category 2 Gas and Dust
Safety Instrumented System (SIS) Classification
SIL3 capable - certified by exida Consulting LLC
Approximate Weight
Aluminum: 3.6 kg (8 lbs)
Stainless Steel: 10.8 kg (24 lbs)
1. The pressure/temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded.
2. Consult your Emerson Process Management sales office for additional sizes.
3
Product Bulletin
SS-263 Volume Booster
62.3:SS-263
September 2014
D103592X012
Figure 1. Sectional View
DIAPHRAGM
ASSEMBLY
INPUT SIGNAL
1
BYPASS RESTRICTION
ADJUSTING SCREW
BYPASS RESTRICTION
NOISE
ATTENUATING TRIM
EXHAUST
PASSAGES
INPUT DIAPHRAGM
FEEDBACK DIAPHRAGM
3 IN 1 CONNECTION
OUTPUT TO
ACTUATOR
1
SUPPLY PORT
1
MOUNTING
ADAPTOR
SUPPLY
1
X0206
1
AUXILIARY
SUPPLY
CONNECTION
(QTY 2) 1
See figure 2 for pressure connection information.
Principle of Operation
Refer to figure 1.
whichever action is required to reduce the pressure
differential. The port remains open until the difference
between the booster input and output pressures
returns to within the deadband limits of the booster.
Because of the restriction, large input signal changes
register on the booster input diaphragm sooner than
in the actuator. A large, sudden change in the input
signal causes a pressure differential to exist between
the input signal and the feedback diaphragm of the
booster. When this occurs, the diaphragms move to
open either the supply port or the exhaust port,
With the bypass restriction adjusted for stable
operation, signals having small magnitude and rate
changes pass through the bypass restriction and into
the actuator without initiating booster operation. Both
the supply and exhaust ports remain closed, allowing
the output of the digital valve controller to act directly
on the actuator piston.
4
Product Bulletin
SS-263 Volume Booster
62.3:SS-263
September 2014
D103592X012
Figure 2. Typical Installation
ACTUATOR STEM EXTENDS WHEN INPUT SIGNAL INCREASES
SS-263
FIELDVUE
DIGITAL
VALVE
CONTROLLER
A
B
D
VENT
SS-263
P
C
FILTER
SOLENOID
DE-ENERGIZED
FISHER 377U
TRIP VALVE
VENT
PILOT
OPERATED VALVE
VENT
E
SS-263
SS-263
ACTUATOR
(VALVE PLUG OPENS
ON AIR FAILURE)
RELIEF
VALVE
VOLUME TANK
REGULATOR
CHECK
VALVE
SUPPLY
GE55034-A
FILTER
SS-263 Pressure Connections:
A: Input Signal
B: Output
C: Supply
D: Diagnostics, dump valve, or actuator bypass assembly connection
E: Auxiliary Supply
5
Product Bulletin
62.3:SS-263
September 2014
Fisher Optimized Digital
Valve Package
The SS263 volume booster is available as an
accessory(s) in Fisher Optimized Digital Valve (ODV)
packages, see figure 2 for a typical installation in a
compressor antisurge application. An ODV package is
a complete, engineered solution designed for
demanding applications including, but not limited to,
compressor antisurge and turbine bypass. The
package includes the actuator, FIELDVUE digital valve
controller, and all other accessories; everything
necessary for a complete installation.
ODV packages are suited towards applications that
typically require fast stroking time and the ability to
respond accurately to small travel setpoint changes.
Applications such as compressor antisurge and turbine
bypass can call for very large valves, over NPS 36,
which require full travels of up to 237/8 inches.
6
SS-263 Volume Booster
D103592X012
Typically valves such as these will need large
pneumatic double acting piston actuators, to provide
the thrust needed for excellent dynamic performance
and ANSI Class V seat leakage.
The SS263 provides the necessary flow capacity to
quickly fill and quietly exhaust either side of the piston
cylinder in these large actuators, providing full stroke
times in less than 2 seconds on positioner control and
in under 1 second on solenoid trip.
Existing installations including, but not limited to the
applications above can greatly benefit with a retrofit
ODV package including the SS263 volume booster by
not only simplifying piping and connections, but also
by increasing performance and reliability of the
installation.
Please contact your local Emerson Process
Management sales office for more information on
Optimized Digital Valve packages.
SS-263 Volume Booster
D103592X012
Installation
Figure 2 shows a typical installation for the SS263
volume booster on the Fisher 685 double-acting piston
actuator. A single regulator that supplies both the
positioner and booster (or boosters) is recommended.
The supply medium must be clean, dry, oilfree air.
Due to the large size of the supply connection and
weight of the volume booster the special mounting
adaptor should be used when possible. This adaptor is
provided by Emerson Process Management as a
component of the SS-263.
The SS263 exhausts air through specially designed
ports located on the perimeter of the diaphragm
Product Bulletin
62.3:SS-263
September 2014
spacer assembly. These passages must be kept clear
and free of debris or foreign materials for proper
performance.
Ordering Information
The SS263 will only be available to order as an
accessory for Fisher control valve assemblies and will
not be sold individually. Please contact your local
Emerson Process Management sales office for more
information or to request a quote.
7
Product Bulletin
62.3:SS-263
September 2014
SS-263 Volume Booster
D103592X012
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co. Emerson Process Management,
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The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
E
8 2012, 2014 Fisher Controls International LLC. All rights reserved.

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